fix: exit on XDP program attachment failure

whoismz · whoismz · commit b2d76b6bf70d · 2025-06-03T10:38:24.000+02:00
diff --git a/mem.c b/mem.c
@@ -218,7 +218,8 @@ int load_ebpf_mem_progs() {
         /* Attach XDP program to the interface */
         bpf_prog_link = bpf_program__attach_xdp(mem_ebpf_skel->progs.read_kernel_memory_xdp, ifindex);
         if (!bpf_prog_link) {
-            fprintf(stderr, "Failed to attach XDP program to interface %s (index: %d)\n", loopback_interface, ifindex);
+            fprintf(stderr, "Failed to attach XDP program to interface %s...\n", loopback_interface);
+            return -errno;
         }
         
         /* Create socket for sending trigger packets */

Original file line number	Diff line number	Diff line change
`@@ -218,7 +218,8 @@ int load_ebpf_mem_progs() {`
`218`	`218`	`/* Attach XDP program to the interface */`
`219`	`219`	`bpf_prog_link = bpf_program__attach_xdp(mem_ebpf_skel->progs.read_kernel_memory_xdp, ifindex);`
`220`	`220`	`if (!bpf_prog_link) {`
`221`		`- fprintf(stderr, "Failed to attach XDP program to interface %s (index: %d)\n", loopback_interface, ifindex);`
	`221`	`+ fprintf(stderr, "Failed to attach XDP program to interface %s...\n", loopback_interface);`
	`222`	`+ return -errno;`
`222`	`223`	`}`
`223`	`224`
`224`	`225`	`/* Create socket for sending trigger packets */`